Determination of vertical daylight illuminance under non-overcast sky conditions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

30 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)498-508
Journal / PublicationBuilding and Environment
Volume45
Issue number2
Publication statusPublished - Feb 2010

Abstract

In a dense urban region in which high-rise buildings are packed inside limited land areas, the daylight components reflected from ground and surrounding buildings play significant roles in daylighting design. The natural light available in an interior strongly depends on the amount of daylight reaching the window facades. Lately we proposed a calculation procedure, presented in form of simple mathematical expressions and diagrams, to determine the daylight illuminance on a vertical plane under overcast skies. This paper extends the study to non-overcast sky conditions. The performance of the proposed method was evaluated by comparison with the daylight illuminance simulated by a lighting software, namely RADIANCE, and with measurements under real skies. It was found that the data estimated by the proposed method were in good agreement both with the values simulated by RADIANCE and with the measured results. The paper offers to architects and building engineers a useful tool for estimating the daylight illuminance and in particular for determining and assessing various daylighting schemes and concepts during design and construction stages. © 2009 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Computer simulation, Daylight illuminance, Non-overcast skies, Obstructions, Reflectance

Citation Format(s)

Determination of vertical daylight illuminance under non-overcast sky conditions. / Li, Danny H.W.; Cheung, Gary H.W.; Cheung, K. L.; Lam, Tony N.T.

In: Building and Environment, Vol. 45, No. 2, 02.2010, p. 498-508.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review